205/55R16 vs 215/70R16
New overall diameter
27.85″
was 24.88″
True speed at an indicated 60
67.2 mph
your speedo reads low
Revolutions per mile
724
was 811, −87
| Measurement | 205/55R16 | 215/70R16 | Change |
|---|---|---|---|
| Overall diameter | 24.88″ | 27.85″ | +2.97″ (+11.9%) |
| Sidewall height | 4.44″ (112.8 mm) | 5.93″ (150.5 mm) | +37.8 mm |
| Tread width | 205 mm | 215 mm | +10 mm |
| Circumference | 78.16″ | 87.49″ | +9.34″ |
| Revs per mile | 811 | 724 | −87 |
| Speedometer error | baseline | +11.9% | reads low |
Diameter overlay
205/55R16 215/70R16
Speedometer check
With 215/70R16 fitted, when the speedometer shows the indicated speed, your actual speed is:
25 mph shown
28.0 mph actual
35 mph shown
39.2 mph actual
45 mph shown
50.4 mph actual
55 mph shown
61.6 mph actual
65 mph shown
72.8 mph actual
75 mph shown
84.0 mph actual
Common questions
- Will 215/70R16 fit instead of 205/55R16?
- 11.9% is past the 5% mark, which is where this stops being a tire choice and starts being a project. Expect rubbing, meaningful speedometer error, and extra load on ABS, stability control and the drivetrain. Recalibration is the usual fix. Your speedometer will read low, so you are going faster than it says. Overall diameter goes from 24.88″ to 27.85″, a change of +11.9%. The rule of thumb most shops use: under 3% is fine, 3 to 5% needs a clearance check, over 5% needs recalibration.
- How far off will my speedometer read on 215/70R16?
- At an indicated 60 mph you are really doing about 67.2 mph, a +11.9% error. The speedometer reads low, so you are going faster than it shows.
- What is the difference in revolutions per mile between 205/55R16 and 215/70R16?
- 205/55R16 turns about 811 times per mile and 215/70R16 turns about 724, a difference of −87. Your speedometer and odometer both count rotations, so this number is what throws them off.